Transmission-casing for tractors.



G. l. GARGETT.

TRANsMlssloN CASING FOR TRAcToRs.

APPLICATIDN FILED DEC. 17',A 19H.

Patented Sept. 10, 1918.

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TRANSMISSION CAS|N G FOR TRACTORS. APPLTcATloN man DEC. 11.*19l1.

1,278,328. Patented Sept. 10, 1918.

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TRANSMISSION-CASING FOR TRACTORS.

Specification of Letteis Patent.

Patented Sept. 10, 1918.

Application filed December 17, 1917. Serial No. 207,563.

, The principal object of my invention is to vprovide a comparatively simple tractor which may be driven at the unusually slow speed required for farm work or ata con siderably higher speed for road travel.

A further obj ect is to provide novel means for driving farm machinery and the like from thetractor while the latter remains at a standstill.

A still further object is to provide a tractor in which the transmission housing or case and the gear cases containing the wheel driving gears are connected to form part of the main frame structure.

lVith the foregoing general objects in view, the invention resides in the novel features of construction and unique combinations of parts to be hereinafter fully described and claimed, the descriptive matter being supplemented by the accompanying drawings which form a part of this specifi Acat-ion and in which:

Figure 1 is a horizontal section part-ly in top plan and Fig. 2 is a rear elevation with parts of the tractor wheels broken away.

In the drawings above brieiiy described,

the numerals 1 designate the side bars of the tractor frame, 2 has reference to a rigid axle below said bars, 3 designates a pair of tractor wheels on the ends of said axle anda indicates a pair of gear cases to which said bars and axle are secured, the ends of the latter passing through said cases as will be clear from Fig. 1.

Positioned longitudinally between the wheels 3 and resting onl the axle 2, is a transmission case 5 which is secured to said axle. in any preferred manner, bolts @being show/u for this purpose, said bolts -passing through the axle and through lugs 7 on the case A rigid tubular axle casing 8 extends from thetransmissiou case 5 to one of the gear and the shaft sections 13 withdrawn.

cases 4 and is rigidly secured to the latter at 9, while the opposite side of said case is formed with integral arms 10 extending toward the other case 4 and joined to a bearing 11 which is in turn secured to said case. By theJ arrangement so far described, the transmission case 5, the gear cases l, the shaft housing S and the arms 9 not only perform their individual functions, but formvpart of the main tractor frame,producing a simple vet rigid frame structure.

The rear end of the transmission case 5 is enlarged at 12 and the inner ends of the two sections 13 of a differential drive shaft extend into said case as illustrated in Fig. 1, said ends of the shaft sections 13 being connected by differentialgearing 14 located within the enlarged portion 12. The outer ends ofthe shaft section 13 carry pinions l5 meshing with spur gears 16 which are carried by the wheels 3 and mounted in the gear cases a, said sections and their pinions being removable from engagement with the diderential gearing 11 b v first detaching plates 1T secured over openings in the outer sides of the gear cases et. said openings being in line with the pinions and shaft sections asl shown in Fig. 1. Set screws 18 carried by the removable plates 17 normally bear against the outer ends of the shaft sections 13 and retain them in engagement with the gearing 14.

One of the shaft sections 13 is rotatably mounted in the shaft housing 8, while J[he other section passes through a tubular shaft r19 which is driven from the housing .Q0 of the differential gearing 111, the outer end of said tubular shaft being rotatably mounted in the bearing 11. This shaft thus forms a housing for oneof the shaft sections 13 and at the same time it affords means for dri ving other machinery from the tractor, being provided with a pulley or other suitable means 21 for this purpose, said pulley being located i between the spaced arms 10 as shown. During the operation of the tractor, the tubular 'shaft 19 rotates at the same speed as the shaft sections 13, but when power is to be. taken from said tubular shaft for driving other machines, the plates 17 are detached Driving of the differential housing QObythe means .yet to be described will therefore" rotate shaft v19 without propelling the vehicle,

. outer concentric gear ring, these rings being' and the speed of this shaft maybbe varied;

the -variable speed transmission employed for drivingsaid housing 20.

Housing 2O is provided With an integral annular flange 22 carrying an inner and an designated yat 23 and 24 respectively. A drive pinion-25 meshes with gear 23 and a similar pinion 2G with the gear 24, both pinions having alined tubular hubs 27 rotatably mounted in bearings 28 suitably mounted in the transmission housing 5. The end of pinion .25 is provided with clutch teeth 29 whilesimilar teeth 30 are formed on the end of the hub 27 of the pinion 26, these teeth l coacting with similar teeth 31 and 32 respectively Which are carried by and movable bodily with a drivey shaft 33 which passes rotatably through the alined hollow hubs 27. Suitable means such as 34 are provided for shifting shaft 33 longitudinally to engage either set of'its teeth 31-32 with the teeth 29-30 of the pinions 25 and 26 and it will thus be clear that either'one of these pinions may be driven. Then pinion 25 is driven', the gear ratio is such as to drive the machiney or the shaft-19 as the case may be, at a relatively. high lspeed', but driving of pinion 26 'will reduce such speed, du'e to the existing ratio between this'pinion and its, gear ring 24. By the provision of this transmission, therefore, either the slow speed required in the field or relatively high speed for road travel may be obtained. Also, this variable I' speed drive is ofadvantage when the shaft 19 and its pulley 21 are being used for driving other machinery froin the tractor.

The frontend of shaft 33 passes slidably but non-rotatably into a suitable universal joint or other coupling 35 which is located at the rear end of a transmission shaft 36 leading from a main transmission housing 37 on the rear end of a suitable motor 38, said housing 3T preferably containing the usual set of variable speed gears as well as a reversing mechanism and clutch. 'AL though this means of driving shaft 33 will in most cases be employed, I wish it `understood that this shaft could well be connected directly to the engine shaft by means of a' drive for the axle housing 20, are consideredhighly important.

the rear end of said 'frame'7 a pair of traction messes Since yprobably thev best resultsl vare ob-v tained from the several specific details shown and described, these details are preferably employed, but .I Wish it understoodthat Within the scope` of the invention as claimed, numerous minor `changes may Well be made. I claim: i

1. In a motor driven vehicle, the combination of a frame, 'a fixed axle supporting wheels rotatable on the ends of, said axle, gear cases secured to said frame, and a transmission case resting on'and secured to said axle, said transmission case having rigid lateral portions secured to said gear cases; together with gearing in said gear cases 0p-4 erati-vely associated with'` said traction wheels, and transmission gearing in said transmission casey for driving said first named gearing. Y

2. In a motor driven vehicle, the combi;` nation of a frame, a' fixed axle supporting the' rear end of lsaid frame, a pair of trac- `tion Wheels rotatable on the `ends of said axle, gear cases secured to said franiell` a. transmission case resting on and securedito said axle, a shaft housing extending lateraily froni'said transmission case and secured @to one of said gear cases, lateral arms spaced apart and extending from said transmissiqyin case to the other gear case, said arms being secured to thisgear case, transmissiongearing in said transmission case', severable driving'connections between said gearing and said wheels including gearing in said gear cases and shafts extending oppositely from: said transmission case (into said gear cases, one of said shafts passing through said shaft housing and the other passing between 'said arms, and a tubular shaft surrounding said last named shaft and forming a housing therefor, said tubular si'rzift being also driven by said transmission gearing and'having a driving wheel locatedbetween said arms for' driving other machinery when said severable driving connections are broken.

' 3. Ina motor driven vehicle, the combi.- nation of a frame, tractor wheels therefor, differential gearing, severable driving con nections between said gearing and said. 115 wheels including two shaft sections connected by said gearing. a tubular shaft `driven by said gearing and surrounding one of said. shaft sections to form a housing therefor, and means on said tubular shaft for taking power therefrom when said severable con nections are broken.

l. In a transmissionunit for motor d vehicles, the combination of a transmise' ,if case, transmission gearing in said case iii-"E125 cluding differential gearing, a pair of sllaftf sections extending oppo itely fronif'said transmission case and driven by 'saididif-I ferentialgearing, a housing for one shaft section extending rigidly from said case, a v1.230

agave;

tubular shaft driven by said dierential gearing and surrounding the other shaft sec-` tion to form a housing therefor, and meansl on said tubular shaft for taking power therefrom to .drive other machinery.

5. In a transmission unit for motor driven vehicles, the combination of a transmission case, transmission gearing in said case in cluding differential gearing, a pair of shaft sections extending oppositeiy from said transmission case and driven by said differentiai gearing, a housing for one shaft section extending rigidly from said case, a tubular shaft driven by said differential gearing and surrounding the other shaft see tion to orrn a housing therefor, a bearing for the outer end Vof said tubniar sha-f,

Aarm extendingv rigidly from said transmis4 Witnesses1 v y @EGBGB IRA GEGETT. Witnesses: f F. H. BoWLAND, JOHN i). FRENQH.

Copies of this patnt may be obtained for me nente each, by addressing she "emmssener or saens,

Wammes, E.' Q. 

